Using laboratory simulation experiments, we investigate plasma flow in the vicinity of the model magnetosphere, especially in the tail region. Luminous thermal plasma is injected by means of a newly designed plasma emitter called the powered double probe (PDP). Time exposure photographs show luminosity along the magnetic field lines which cross the position of the PDP. The results obtained from different positions of the PDP show four regions of illumination. The dependence of the illuminaton width of such artificial plasma on the PDP positions yields information on energetic particles and their diamagnetic effect. Artificial plasma injection illuminates trajectories of energetic particles produced in the nightside magnetosphere. In particular, when the PDP is located in the tail at a geocentric distance corresponding to about 15 to 18 RE, an especially bright luminous line was found to form. It is suggested that this phenomenon results from plasma intrusion into the magnetosphere through the dayside cusp region. In order to examine the effect of the intrusion of the interplanetary magnetic field (IMF) into the magnetosphere, an external quasi-static magnetic field is applied that simulates the IMF. The result reveals the structural form of magnetic field lines which indicate characteristics of a stable ''open'' magnetosphere. In the presence of southward IMF, a neutral line was formed at about the locaton where the linear sum of the external vaccum magnetic field (IMF) and the distorted dipole field BM (without Bz) becomes null. This result seems to imply a direct IMF control of energy coupling between the solar wind and the magnetosphere.